- 目录
- 混凝土与制品
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微膨胀型防腐剂对水泥混凝土耐久性的影响
作者：张小平，刘燕，李新新，吴文选，杨辉
（武汉三源特种建材科技有限公司，湖北 武汉 430080）
摘要：研究了微膨胀型防腐剂对水泥混凝土力学性能与耐久性能的影响，其中微膨胀型防腐剂由防腐组分（KS）、微膨胀组分（FQY）、活性矿物掺合料组成。结果表明，随着微膨胀型防腐剂中FQY掺量的增加，砂浆与混凝土的抗压强度先提高后降低。当
m（防腐组分）∶m（矿粉）∶m（粉煤灰）∶m（微膨胀组分）=2∶3∶2∶3时，砂浆的抗压强度与空白组相比显著提高，7 d与28 d砂浆抗压强度比分别为110%、113%；掺微膨胀型防腐剂的混凝土28 d氯离子迁移系数为1.57×10-12 m2/s，达到RCM-Ⅳ等级，且混凝土的抗渗等级不降低；经过150次硫酸盐干湿循环，混凝土抗压强度耐蚀系数为101%，试块质量无损失，具有优异的抗硫酸盐侵蚀性能。
关键词：微膨胀型防腐剂；力学性能；硫酸盐侵蚀；渗透性
中图分类号：TU528.042 文献标识码：A 文章编号：1001-702X（2020）12-0015-04
Effect of micro-expansion preservatives on the durability of cement concrete
ZHANG Xiaoping，LIU Yan，LI Xinxin，WU Wenxuan，YANG Hui
（Wuhan Sanyuan Special Building Materials Technology Co. Ltd.，Wuhan 430080，China）
Abstract：The effects of micro-expansion preservatives on the mechanical properties and durability of cement concrete were studied，in which micro-expansion preservatives were composed of anti-corrosion components（KS），micro-expansion components（FQY），and mineral admixtures. The results show that with the increase of FQY doping in micro-expansion corrosion-resistance admixtures，the compressive strength of mortar and concrete first increased and then decreased. When the anti-corrosion components∶mineral powder∶fly ash∶micro-expansion components is 2∶3∶2∶3，mortar compressive strength compared to blank significantly improved，7 d and 28 d mortar compressive strength ratio is 110% and 113%，respectively. Mixed with micro-expansion preservatives in concrete，the chlorine ion migration coefficient of 28 days is 1.57×10-12 m2/s，which reaches RCM-Ⅳ grade，and the anti-penetration grade of concrete is not reduced. After 150 times sulfate dry and wet cycle，the resistance coefficient is 101%，the test block quality is not lost，and has excellent anti-sulfate erosion performance.
Key words：micro-expansion preservatives，mechanical properties，sulfate erosion，permeability